\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Logarithm Grid table\label{log\_G}}
\begin{tabular}{l*{8}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}&\multicolumn{1}{c}{(7)}&\multicolumn{1}{c}{(8)}\\
            &\multicolumn{1}{c}{log\_fe2\_R}&\multicolumn{1}{c}{log\_fe2\_H}&\multicolumn{1}{c}{log\_fe2\_W10}&\multicolumn{1}{c}{log\_fe2\_W15}&\multicolumn{1}{c}{log\_fe2\_W20}&\multicolumn{1}{c}{log\_fe2\_O10}&\multicolumn{1}{c}{log\_fe2\_O15}&\multicolumn{1}{c}{log\_fe2\_O20}\\
\hline
log\_L3\_sd   &       0.291\sym{***}&       0.312\sym{***}&       0.297\sym{***}&       0.297\sym{***}&       0.295\sym{***}&       0.298\sym{***}&       0.298\sym{***}&       0.294\sym{***}\\
            &     (0.074)         &     (0.077)         &     (0.076)         &     (0.076)         &     (0.075)         &     (0.072)         &     (0.074)         &     (0.075)         \\
log\_R\_L3\_sd &       0.174\sym{***}&                     &                     &                     &                     &                     &                     &                     \\
            &     (0.061)         &                     &                     &                     &                     &                     &                     &                     \\
log\_H\_L3\_sd &                     &       0.118\sym{***}&                     &                     &                     &                     &                     &                     \\
            &                     &     (0.041)         &                     &                     &                     &                     &                     &                     \\
log\_W10\_L3\_sd&                     &                     &       0.131\sym{***}&                     &                     &                     &                     &                     \\
            &                     &                     &     (0.043)         &                     &                     &                     &                     &                     \\
log\_W15\_L3\_sd&                     &                     &                     &       0.126\sym{***}&                     &                     &                     &                     \\
            &                     &                     &                     &     (0.043)         &                     &                     &                     &                     \\
log\_W20\_L3\_sd&                     &                     &                     &                     &       0.154\sym{***}&                     &                     &                     \\
            &                     &                     &                     &                     &     (0.052)         &                     &                     &                     \\
log\_O10\_L3\_sd&                     &                     &                     &                     &                     &       0.132\sym{**} &                     &                     \\
            &                     &                     &                     &                     &                     &     (0.052)         &                     &                     \\
log\_O15\_L3\_sd&                     &                     &                     &                     &                     &                     &       0.118\sym{**} &                     \\
            &                     &                     &                     &                     &                     &                     &     (0.046)         &                     \\
log\_O20\_L3\_sd&                     &                     &                     &                     &                     &                     &                     &       0.155\sym{***}\\
            &                     &                     &                     &                     &                     &                     &                     &     (0.053)         \\
\hline
r2          &       0.889         &       0.887         &       0.887         &       0.887         &       0.888         &       0.887         &       0.886         &       0.888         \\
\hline\hline
\multicolumn{9}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{9}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<.05\), \sym{***} \(p<.01\)}\\
\end{tabular}
\end{table}
